Grimac TWENTY Series PUL 2 Operating And Maintenance Instructions Manual page 21

On all models, the pressure gauge continuously indicates the internal boiler pressure and the coffee dispensing pressure in accordance
with the specifications set out in the table on page 37.
Adjust the pressure switch screws to adjust pressure inside the water heater.
Adjust the internal pump screw to adjust coffee dispensing pressure.
Always maintain the level of water in the water heater above the minimum mark.
The coffee machine that you have purchased is fitted with a water heater in top quality copper. When the machine is in use, it contains
steam and hot water under pressure. DANGER OF BURNS.
Check the steam nozzles located on the sides regularly and clear them of any obstructions.
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